Trackpad Freezing After Replacement & Tests Fine
MacBook "Core 2 Duo" 2.13 13" Mid 2009-MC240LLA -A1181-2330
Symptoms - Trackpad freezes or becomes unresponsive intermittently. When it returns to normal, works just fine. Unit has Win7 installed via Bootcamp. Symptoms are NOT present in Win7, trackpad works fine.
History - Unit was bumped while open and running when my son tripped while going up the stairs. Impact was on the back corner. Resulted in minor crack in lower case, no other obvious damage.
Lower & top cases replaced. Memory and hard drive have been swapped with a "twin" Macbook and the symptoms stayed with the Macbook, confirming it is hardware not software (one would think anyway).
Apple Store tested the trackpad - it tested as good. Told to reinstall the OS. Reinstalled the OS from the recovery partition, leaving the user accounts in tact along with the Win7 partition (bootcamp). Symptoms remain.
Back to Apple who tested the trackpad again, confirming it was fine. Told to wipe the HD and perform a clean install.
Put a blank HD in and installed a fresh copy of OS 10.8. Did NOT migrate any files or settings from the other HD or account (completely virgin install). Symptoms remain.
What next? I'm ready to put this up on eBay and start over with another unit. Only other suggestion I've received is that it is the logic board. Don't want to spend that kind of money and time with 100% confidence.